Grinding-machine.



s. E'. VAN NORMAN. GRINDING MACHINE.

APPLICATION FIL-ED JAN. 30,71914.

Patented July 7, 1914,

Patented July 7, 1914.

G. E. VAN NRMAN.

GRINDING MACHINE.

APPLICATION FILED JAN. so, 1914.

GL E, VAN NRMAN GRINDIN'G MAGENE.

AlPLoATOH FILED JAL'. so, 1914,

Patented July 7, 191%.

5 SHEETS-SHEET Quand..

ITVVESSES:

A 1'" TORN C. E. VAN NQRMAN.

GRINDING MACHINE.

' APPLICATION HLBD JAN.30,1914.

Patente uly g WM.

6 SHEETSaSHEET t'v LVITNESSESJ GRINDING-MAGHINE.

Specification of Letters Patent.

Patented July 7 1914.

.application tied January 3051.914. serial nc. 815,368.

To all 'whom it may concern Be it known that CHARLES E. VAN Non- MAN, a citizen of the 'United lStates of America, and resident of Springfield, in the county l sette, have invented certain new and useful improvements in Grinding Machines, of which the following is a full, clear, and 'exact description.

This invention relates to in a grinding machine of a lass which is Acharacterized, by the provision of a rotary tool spindle, and a head, on which the piece to be worked upon by the grinding Wheelor other tool may be carried and rotated, which head is mounted for, and automatically caused to have,- oscillation on an axis which is4 at right angles to the axis of the tool spindle.

The machine of the class to which this 1nventi'on` relates is especially available for the grinding, finishing or polishing ofthe annular internal ball race grooves in rings employed in ball hearings.

On@ object of this invention is to provide means of practical and convenient character for throwing the oscillatory Work carrying head out of connection fro-1n, or into connection with, the mechanism which is included in the machine for imparting mechanically and automatically the partial-rotary recipvrocatory motion or oscillation. to the head,

which means is operable during the action of the oscillation imparting means.

Another object of the invention is to provide means whereby the range of Oscillation of the Work carrying head, or length of the arc of oscillation may be varied to correspond, for instance, to ball race-grooves in rings of different depths and consequently comprising in the arc conforming to the transverse contour a greater or less number of degrees of a circle.

l Another object of the invention is to provide means whereby the region or field of oscillation. to whatever extent such oscillation maybe, may be varied.

Another object of the invention is to provide means for causingv the oscillation of the Work carrying head which is of an improved character and will especially insurea perfectly steady action, providing against any lash or chattering'betiveen the tool and the 'piece being operated upon thereby when the'piece has been swung to its limit in one of Hampden and State of Massachw 'inprovernents 'i' direction and is receding, or about to recede in its reversed sivinging'movement'.

Another object ofthe invention is to Vso mount and support the oscillatory Work carrying head that the spindle of the chuck 50' or revolru-ble work holder is supported in a most stable and unyielding manner and especially so that there may be no deiection of She spindle transversely'iof the axis thereof. Y Alli y,ther object of theinvention is to pro- 6:5 iide/ riechanism whereby the grinding' or finishing action of 'the rotary tool may ybe automatically performed in part upon a surface which in transverse contour comprises an arc of a circle and in part upon a surface` 7c tangential thereto.

Another object of the invention is to pro- 1 vide improved means for acquiring the cross feed of the support for the rotary tool carrying spindle and means for automati- 76 cally insuring a cessation of the cross feeding action as predetermined; and other objects of the invention and advantages derived therefrom will be rendered apparent in and by the description hereinafter given.

The invention is described in conjunction with the accompanying drawings and is deined in the claims. y

In the drawings :Figure 1 is a front elevation of the improved grinding machine. Fig. 2 is a partial front elevation to illustrato the cross feed mechanism for the grinding Wheel spindle support. Fig. 3 is an elevation with parts shown in Fig. 2 as seen at right angles thereto. Fig. 4 isla partial horizontal sectional vieWo-n line 4 4, Fig. 2. Fig. 5 is a. horizontal sectional view taken on the plane indicated by iine 5 5, in Figs. l and 8. Fig. 6 represents hall racerings of a very common kind and for the grinding of the grooves of which this machine is especially Well adapted. Fig. 7 is a diagram to ,be hereinafter referred to. Fig. 8 is a vertical sectional vien7 through the base portion of the oscillatory Work carryingr supportand the parts of the machine located at and adjacent the axis of oscillation. Fig. 9 is a View similar to Fig. 5 but showing additional provisions required in the machine for the. grinding of ball races of the particular kind referred to in the statement of the objects of the invention7 Fig. 10 being an illust-ration of the ball race havingy the form just referred. to.Y Fig.. 1-1 is a partial plan View, and-Fig; 12de across sectionalview lbe ground and the particular shapes of such forms the support for the base which has itsv on line l2-12, Fig. 11 illustrating a capability in the 'machine which is necessary when the same is equipped for the grinding of ball races of the type shown in Fig. l0. Figs. 13 and 14 are diagrams to represent relations and relative motions of partsto parts. Fig. l5 is a partial elevation showing a device operative for the connection and disconnection of. the oscillatory head and the means for imparting the operating movement thereto. Fig. 16 is a plan View especially showing provisions hereinafter referred to.

In the drawings, A represents the supporting frame or bed of the machine mounted on which is the head B in which. is ]our naled the spindle C on an axis which 1s horizontal and ranging 0n what is here ref garded as the longitudinal line of the niachine. The said spindle is represented as be-l. ing provided with a grinding wheel D; and suoli spindle is understood as driven at a verygy high rate of speed through means therefor forming no part of this invention. The lower portion of the head AB is formed a/nd engaged for a horizontal cross sliding movenient on another slide E 'which is so mounted on and engaged with the bed or frame A as to be capable of a, longitudinal sliding movement relatively thereto. G represents the head iirwhieh is rotatively mounted a spindle G2 which carries a holder G3 for the annular piece such` as represented by ai and in which the grobve thereon is to be i ground and accurately finished. .The head G is slidably adjustable on another Slide H y which in turn is slidably adjustable on a l base member J which is mounted for oscil-/f lation on the vertical axis represented by the line g/-1/, Figs. l and 8, and by the axial. center iudicating'points y/ in Figs. v5, 9. 13, l-land 1G. rlhe movement which the head G which directly carries the work holder G3 has on the slide H is one which is always radial to the center g/of oscillation of' the base J,` while the movement of the slide H. is. at right angles to'such radialmovement-line of the head G.

K represents a post to the upper/ end of which the base for the work carry'hg head is connected and by which post when the latter is oscillated the base and head carried thereby are also correspondingly oseillated. i y

` The bed or frame A of the Ina/chine at the portion thereof which is under .the base J for the work holder carrying y,head is fitted with a section A2 therein pf cylindrical form with a central bore therethrough for the accomi'nodation of the post K and constructed with a somewlnitmassive circularflange A, the top of' which is planed pertcctly fiat, and finished smooth, and which /cl is extended downwardly oscillation with a con'yparatively broad surface bearing thereon. The comparatively thick flange A3 of the said section A2 of the bed is directly .ilstained by thc'portion A* of the bed propel' thereunder; and it will be perceived that the base J has a support, at the portion th reef which is under the jean-nal hearing Ufer the shaft carrying the work holder G/ By this construction the rotary work holder shaft may be run without' any deflection and with the utmost ste v diness.

:L represent an annular member loosely surrounding nd revolubly .movable relat"\'ely to the/ post K, and in combination with which, mechanism, of a kind herein- /after descril/ed. for imparting a partial rotary reciprdcatiry motion or oscillation to such annul" r member, is provided. It is to be underst od that while the machine is being run, Iich oscillatory motion of the annular me iber is constant and a corresponding oscill/a-tory motion of the work carrying head ensues so long as the annular member L is connected with the post K.

For ,the connection and disconnection of the member L and the post K, parts and constructions'are provided as follows: The annular member has in its under side a Socket I) for a locking pin; c representa a .member affixed to the post .next below the annular member L and which is provided with the locking pin al fitted to play verti- 'a" ly in a suitable bore therefor in the part i/and to engage into and disongage troni the aforementioned socket The locking pin and has engagement with a lug or projection c2 of a flangcd collar c which is `vertically slidable relatively te the lower portion of the post. The spring is so applied as to exert an upV ward forcing action on the collar so that. when permitted. the collar will risc and carry the pin ci into locking connection with the annular member L. This merely one form of a clutch. To operate the collar, a short shaft e5 is rotatively fitted in the sidov of the frame, the saine having an eccentric stud or roller fr engaging with the flange oi the collar c, i which it .may he operated.

The part referred to as the annular incinhcr L is, as will bc perceived in Fig. El, comi'ioscd of'two sections, the one f' heilig that to which the oscillation imparting linli M is connected, while the one f2 is that in which the socket is provided and/fin which the cnA gagement of the locking pin (Z is eflecicd. The section f is made with a huh f about which the section f2 is fitted. Thc'one scction has alrnnnular T-slot f* for the reception of thel heads and portions of the shanhs o1 bolts f5 which pass through the thickness of the other section, receiving locking nuts thereon. By this provision it is possible hy and also a handle by means of."

the section f, which is the one having the' link connected thereto and cannot be revolubly moved only as the link imparts such movement thereto,-the field of oscillation of the work carrying head, connected by its base J to the post K, may be varied as may be necessary to accord with different characters of work to be performed in the machine.

Reference being had to the diagram, Fig. 7, it may be said that the field of oscillation may, for instance, be one limited by the lines "w, w, or by the adjustment permissible between the sections f and f2 of the annular members, the field of oscillation may be within the limits defined by the line to2, wz. The dotted lines to, fw', as compared with those wz, or those w3, w3, as compared with those lw, indicate an extension of the range of the oscillation of the work carrying head which may be accomplished by the oscillation imparting means to be now described, reference being had to Figs. 1 and 5.

N represents a vertical shaft located within the frame of the machine and rota-tively driven from the driving pulley N2 on the shaft N3, which by bevel gearing N4, N5, drives a`horizontal shaft NG which by the bevel gears N7 and N8, have connection with the vertical shaft N. The said shaft N has a cam O affixed thereon with the edge of which coacts the roller stud P2 of the lever P pivoted at P to swing in a horizontal plane and with an intermediate portion of which lever one end of the link M is connected, the other end ofv such link being by pivot L connected, as before stated, to the annular memberI L.

The spring M2 has one end secured to the link which is jointed to the lever, and having its other end secured toa fixed part of the frame and maintains the roller stud P2 always in contact against the edgeof the cam and prevents any lash or lost motion especially at the time when the reversals the swing or oscillation of the jointed parts take place, and this is especially advantageous for perfection of the grinding operation of a groove in a ball race ring. A' sheaveguided weighted cord connected in the manner the spring is shown to be would be the equivalent thereof.

The pivot connection of the link M and the lever P is an'adjustable one by reason ofthe stud and'slot formation represented at M3 and P5 in Fig. 5, so that from a given cam the throw of the lever and the oscillation imparting thrust of the link may be in greater or less extent accordingly as the connection M3 is farther from or nearer to the center P of swinging motion of the lever; and, therefore, it is manifest in what manthe work holder head may be varied.

It is desirable that the oscillation of the work be just suiiicient 4to-carry the groove in the ring being ground back and forth,relatively to the edge ofthe grinding Whee from one edge of the groove to the other,` no scantiness of movement nor over-running of movement being permissible for the .best and most speedy accomplishment of the ball groove grinding.

Inasmuch as the distance between the different pointsl of possible attachment of the link along the length of the lever P and the. point of the link connection with the annular member L is variable under the different adjustments, the link is made longitudinally distensible andcontractible, the same being represented as compo-sed of the sections m, m2 andlma, the latter being a right and left hand threaded screw engaging into tapped bores in approached ends of the sections m and m12.

The race ring which is to have the groove @v2 ground therein, is carried in the work holder (Sia which is so located, by the proper adjustment of the head G radially relatively to the .axis of oscillation indicated by y, that the are of the groove cast or formed in the ring to be finished in this machine is concentric with said axis line: This will be apparent on an inspection of Fig. 13 which shows the axis of oscillation and the limit-s in opposite directions of the oscillation of the rlng which. is understood as having rapid rotation imparted thereto through means of the vbelt and pulley (indicated at Gr2 in Fig. l of the drawings).

The grinding wheel, the high speed spindle of which is mounted on the head B, is, by the cross feed of substantially usual kind which is provided for coaction between the head slide B and the longitudinal or base slide E, carried rearwardly beyond 4the center of the work holder and race ring therein so that the edge of the wheel will have its grinding contact against the surface of the ball groove,the automatic character of the cross feed insuring a very slow and limited transverse feeding movement as the grinding laction 'progresses and until the grinding of the groove with precision to the exact extent required shall have been accomplished.

rI'he slide E which is movable longitudinally on the bed has at its end op osite that at which the grinding wheel is lidcated, an adjustable screw stop g'so that when the slide is run toward the oscillatory work carrying head it can go no farther than to present the grinding wheel at its proper werking position, which is one whereat a plane centrally through such wheel,`midway between its opposite faces andat right aingles to its axis, intersects the oscillation ner the range-or extent of the oscillation of axis line y., such point of intersection being be bodily withdrawn lo gitudinally to retire the grinding wheel from proximity to the work as frequentl` desirable for .the testing, and for the rem 'val of one piece and the mounting in place of another piece.

The slide B nl the head of which the grinding wheel spindl 'C is carried has the very slow feed motion thereof transversely of/the base slide imparted through they feed screw shaft Q, understood as combined with and between the' slides B and E in a manner usual and well known; but the particular means `devis ld by me in this machine for automaticilly imparting the rotary movement to t e feedscrew and auto matieally terminatitg the feed movement at a predetermine. time will be now dey scribed. so

Adjacent and pa 1allel with the feed Screw shaft Q is a short haft Q2 having a ratchet wheel Q3 and a pi ion Q* atiixed thereon,- said pinion meshiig into a spur gear wheel Q5 fasten the f ldscrew shaft.

Q8 represents a pivoted and oscillatory pawl carrier a` jacent thel edge of the ratchet wheel, r with the teeth of which wheel the paw] 7 engages.

R represents/a member mounted for oscillation on the shaft Q2 and substantially7 radially extended beyond the edge of the ratchetwheel and provided with an adjustl able abutmentmembeR2 made in the form abutment member R3 for coaction with the pawl carrier.

On thev shaft N is a cam S revoluble in a horizontal plane, and this cam advantageously isformed as a protuberance on the upper'iaec of the aforementioned cani O crunprised in the means for the oscillation of the worh cari-.ving headG. The cam. revolving# impairs a rising, and permits a falling movement of the thrust rod S2 which plays through the top of' the bed or machine frame and causes .an up and down swinging movement ofthe tiltable plate. S3. The upward swinging movements of said plate as imparted by the cam thrust rod are always in the same extent, but there may be a lost motion between the tiltable"` plate andfthe abutment member R in amount accordingly7 as to whether said. abutment 'screwed considerably upwardly or left considerably protruding` below the e.\'tremit}7 of the member R. By this means the cross feed motion of the grinder spindle head, always comparatively slow, may be at the maximum of suoli slight speed or at a, very much diminished rate according tothe dcsires or requirements of the operator.

Upon the rear side of the ratchet; wheel encircling the short ratchet wheel ft Q2 is adisk la, having an extension 71.2 to the edge. of the ratchet wheel, the extremity of which is forwardly right angularly turned to form a shield )is which will, when the portion of the ratchet .wheel edge relatively to Awhich the shield is adjustedis brought' to proximity with the pawl, throw out or prevent the pawl in its reciprocations from taking into the ratchet wheel teeth.

The disk is peripherally grooved as shown in Fig. t in which engages the flange or lug` at the inner end of a bolt i/zf, which bolt has the tensioning nut h5 combined.

therewith-in such a manner that when the` nut is screwed up against the outer face ot the ratchet wheel it will exert a tightening draft on the bolt, causing the head or lug thereof to bind the disk .firmly against the rear side of the ratchet, wheel. The shield may be re'volublyr adjusted when the nut is loosened to permit the groove edged dislc to freely turn around on the ratchet wheel shaft.

The ratchet wheel shaft is provided with the usual handle Qs for manually quickly turning'it for the quick withdrawal of the head carrying the grinding wheel so that the latter will be transversely displaced whenever desired, from its workinglocation.

The details of construction of the pawl ac.- tuating means may be considerably changed without evasion of my claim thereto.

The machine in addition to the grinding or finishing the surfaces of grooves in ball 1 titl race rings, of the form shown in Fig. 13, is

also adapted for the grinding or finishing the surfaces in rings of the type shown in Fig. lll, wherein it is seen that the internal surface in the ring comprises, as considered in cross section, a portion mfwhich is the arc of a circle and a portion :c3 which is tangential thereto and conformable to the circumference of a cylinder. For the grinding of work of this hind, the work carrying head has an oscillation, as from a. position shown lin the full lines in Fig. l to that shown in dotted lines. and then the work carryinghead remaining at rest with the axis of thework parallel with the axisof the grinding wheel spindle, the carrier for the latter spindle has imparted thereto a longitudinal reciprocatory movementfor the grinding of the surface war-tbe oscillatory movement of the l work carrying head and the reciprocation of the grinfling wheel being alternated. And for the performance of work of the character just above mentioned, the machine is equipped as represented in Fig. 9, with a cam T, onY the shaft N, and additional to the cam' '0, the function of which has been hereinbefore fully stated. With lthis cam T coacts a lever U pivoted at U2 and having adjustably connected along the length thereof a link V having connection with the slide E. The spring U2 has connection with the lever U for maintaining the roller stud thereof at all times in edge- Wise contact against the cam. The lever U has a screw shaft U3 mounted thereonand in such arrangement that it may be conveniently turned, such screw shaft being operative to adjust the position, as may be required of the block U4L to which by the pivot U5 the connection between the link V and the lever U is melder-this providing for required variations in the longitudinal movement of the base slide forthe grinding wheel spindle. j

The kbase slide E, represented in Figs. 1-1 and 12, is made with the supplemental mem-. ber WV to which the link V is connected. rlhis member W has rack teeth VZ thereon with which meshes the pinion E5 on the shaft E3 which Ais provided with the hand operating lever E, said shaft being mounted in,

` the slide proper E. In this instance the adjustable screw stop g2 carried by the base;

slide E has its limiting abutment against the end of the supplemental slide member W, as indicated in Fig. 11.` Y

Under Workingconditions the hand lever E* is swung to cause the base slide E to be moved to itslimit in the direction ofthe oscillatory work carrying head,-the engagement between the pinion E*s and rack W 2 maintaining these parts in set relations but permitting the purposed movement of the base slide E for the withdrawal of t-he grinding Wheel, on the line of its axis, out of proximity to the ring being Worked uponA when such temporary positioning is desirable..

The machine may be made with equipments herein just described in conjunction with Figs. 9, 11, and 12, which are so conditioned that the means for imparting the automatic longitudinal reciprocation ofthe base' slide may be removed, or thrown out of connection and rendered inoperativewhen only the oscillation of the Work carrying head relatively to--the grinding lwheel revoluble in a fixed position .is necessary. And it is to be noted that when the machine is being employed for a grinding of arc grooves in ball races such as shown 1n Fig. lf. the cani t) will he of a shape to cause, after the swinging of the work carrying headin one direction, the immediate reverse swinging thereof without dwell y between the movements; but where the race the slide Gr which is movable on the slide H on a line radial to the said axis y of oscillation has a stop u which is coperative with a stop u2 on the slide h. lThese two sets of stops havesuch relations that when respectively simultaneously brought to coincidence they determine an invariable relation 'of the Work holder spindle to thve'said axis y of oscillation; and they serve as datums of measurement for adjustably positioning the slidable members to insure' that differently sized grooved pieces to be op erated vupon of known dimensions carried by the spindle andhaving known relations 1 to the latter, as determined by the dimensions of the work holder at G3 shall be su ported so that the center from which t e arc of the' groove in the piece of work is generated is exactly at the said axis of oscillation. l

As worked out in practice, the'outer face of the shoulder or collar o of the'spindle is to be considered as the point or surfacev which may be brought to an'invariable. relation to the aforementioned axis of oscillation when the stops u and u2 are brought to abutment; and the axis of the spindle will always intersect the axis of oscillation when the stops t and t2 are brought to abutment; therefore, by having gage lugs,'-rods or bars with their ends rigiit angular. to their llengths,-resl'iectively corresponding to work holders G3 of different lengths, plug half the width of the ring to be grooved, and to the distance from lthe center of the ring to the point y from which the arc groove is generated, such gage plugs by being mounted to determine the separations between the stopsu and u?, and t2, will insure that the work carrying fhead with the ring or piece to be operated upon will be positioned exactly so that the arc center and the axis of oscillation c/ will be coincident as is absolutely necessary for the proper operation of the machine.

Of course, instead of' the 'employment of gage plugs as hereinabove mentioned to be supplied in sets corresponding to different work holders, a measure scalecould be lemployed; but it is preferred to provide the gage plugs for precision of results and the avoidance oi possible mistakes; and by the provisions' of the gage stops an unskilled a rotary tool, and means for riiitativcly driving it, a work carrying head mounted for oscillation on an axis angular th the axis ofthe tool spindle, means itor imparting oscillatory movement to said head which is adapted to b c connected with' and discon nected from the latter, and means located on tilted part of the machine and-adapted to control the action. o1" the connecting and disconnecting means.

in a machine of the character described, in combination, a spindle carrying a rotary tool and means 'l`or rotatively driving it, a Work carrying head located for oscillation on an axis angular to the aXis of the tool spindle', a member adapted to move in ccipcrative axial relation With said head, means t'or adjusting the field of 0scillation ot said member and head, means for imparting oscillatory movement to said member, means for disconnecting said mem ber and oscillation imparting mechanism and for refecnnecting at the proper location, and means located on a fixed part of the machine and adapted to control the action of the connecting and disconnecting means while the oscillation imparting mechanism is in motion. 1

3. In a machine of Athe character described, in combination, a spindle carrying a rotary tool and driving means therefor, a head mounted for oscillation, a vertical pivotal post connected with said head, a spindle journaled in said head, and means for imparting oscillatory movement to the head, a bed on the ton of which the base. of said head has a surl'ace contacting bearing support, a supporting portion of such contact surt'ace having a location directly under a substaiiti'al bearing portion of the length ofthe spindle iournalcd in said head, and means 4for constituting al journal bearing for the said vertical poste i l. In a machine of the character described, in combination, a horizontal rotary tool carrying spindle and means for driving it, a head arranged for oscillation on a vertical axis, and having a `iournal support, in which a, rotary work carrying shaft is mounted, a bed on the top ot which the base of said head has a sui-tace contacting bearing sup- -inert, avsupporting portionv of such contact surface having a location directly under a substantial portion ol` the length of the spin die ionrnaied in said head, means for irnpa'iriirag oscillatory motion to said head, and

is connected to anupper portion of said post,

an annular member, surrounding, and revo lubly movable relatively to, the post, a mem ber allixed to the post adjacent the annular member, means for detachably locking said members together, While the means for oscillating the annular member lare in motion.

" 6. In a machine of the character described, in combination, a bed, a feed-slide, having a horizontal tool carrying spindle movably mounted on the bed, a vertical post,

to be .oscillated, a head, the base of'ivhich connected to an upper portion of said post, and having a horizontal work carrying shaft, yan annular member, surrounding, and revolubly movable relatively to, the post, a member affixed to the post adjacent the annular member, and provided 'with a locking device vertically movable and adapted for a locking enga ment with, and disconnection from, sal

annular member, a collar slidable on the 0st and having an actuation connection wit the locking device and means for slidably oierating the collar.

7. In a machine ofthe character described, in combination, a bed, a feed-slide, having e. horizontal tool carrying spindle movably mounted on the bed, a` vertical post, to be oscillated, a head, the base of which is connected to an upper portion of said post, and having a horizontal work carrying shaft, an annular member, surrounding, and revolubly movable relativelyto, the post, and having inits under side a socket, a member affixed to the post adjacent the annular member, and providedwith a locking pin vertically movable and'adaptcd for a lockingengagement in, and disengzwemeut from, said socket, a flanged collar shdablc on the posiz and having a connection with the locking pin, and a rotative element having an eccentric-y projection in engagement in the flange ot' said collar.

8. ln` a machine of the character .describcd, in combination, a bed, al feed-slide, having` a, horizontal tool carrying spindle movably mounted on the bed, a vertical post to bc oscillated, a head, having a horizontal work carrying shaft, and having the base thercot' connected to the upper ond of the post, anannular mci'nber. surrounding, and rcvolubly movable relatively to, thc post, and composed ot two sections, one of which llt) lOl)

- is revolubly adjustable relatively to thel appartenant to the post.

the cam coacts for imparting oscillatory other, with means for coniinlng said sections in their adjusted relations, a member aiixed 2 to the post adjacent the sectionally composed annular member, means for detachably locking the post aixed member and one section of the annular members together, and means for oscillating the other section of the annular member.

9. In a machine of the character described, in combination, a spindle carrying a rotary I tool andv driving means therefor, a Work carrying head mounted for oscillation on an axis angular to the axis of the tool spindle and cam actuated mechanism for imparting oillatory movement to the head, which mechanism comprises means operable for a retractile action coacting with the motion imparting means, and means for increasing and diminishing the range of oscillation. l

10. In a machine of the character described, in combination, a spindle carrying a rotary tool and driving means therefor, a work carrying head mounted for yoscillation on an axis at right angles to the axis of the tool spindle, a cam, and means with which movement to the head, and means whereby the field of oscillation of the head may be changed.

11. In a machine of the character described, in combination, a spindle carrying a rotary tool and driving means therefor, a Work carrying head mounted for oscillation on an axis angular to the axis of the tool spindle and a cam, and means with which the cam coacts for imparting oscillatory movement to the head, which mechanism comprises means for increasing and diminishing` the range of oscillation, and means whereby the field of oscillation of the head may be changed. 4

l2. In a machine ofthe character described, in combination, a spindle carrying a rotary tool and means for rotatably driving it, a work carrying head and a post with which it 'is connected mounted for oscillation on an axis angular to the axis of the tool-spindle, a member and means for connecting it y,to the post, a cam, a pivoted lever with which the cam coacts, and a link connected to the lever and to the said member 13. In a machine of the character described, in'combination, a spindle carrying av rotary tool and means for rotatively driving it, a Workfcarrying head and a post with which it is connected' mounted for oscillation on an axis angular-to the axis'of the tool-spindle, a member and means `for connecting vit, to the post, a cam, a pivoted lever with which the cam coaCtS, and a link, composed of separate sections, which are adjustably connected, connected to the lever and to the said member appurtenant to the post.

li. In a machine of the character described, in combination` a spindle carrying a rotary tool and means for rotatively driving it., a Work carryine1 head and a post with tool-spindle, a member and means for connecting it to the post, a cam, a pivoted lever with which the cam coacts, a link connected to the lever and to the said member appurtenant to the post, and means -operable for a retractile action on the connected link and lever.

l5. In a machine of the character described, in combination, a spindle carrying a rotary tool and means for rotativelyv driving it, a work carrying head mounted for oscillation on an axis angular to the axis of the tool-spindle, a cam, a pivoted lever with which the cam coacts, and a link, connected to the lever and havingan oscillation imparting connection with the Work carrying head.

16. In a machine of the character described` in combination, ay spindle carrying a rotary tool and means for rotatively driving it, a work carrying head mounted' for oscillation on an axis angular to the axis of the tool-spindle, a cam, a pivoted lever with which the cam coacts, a link, and means for adjustably pivotally connecting the lever at dillerent points along the. length of the latter, said link also having an oscillation imparting connection with the Work carrying head.

17. In a machine of the character described, in combination, ,a spindle carrying a rotary 'tool and means for rotatively driving it, a work carrying head mounted for oscillation on an axis angular to the axis of the tool-spindle, a cam, a pivoted lever With which the cam coacts, a link composed of suitably formed members which are distensibly and contractibly connected, and means for ad j ustably pivotally connecting the lever at ditl'crent points along the length of the latter. said link also having an oscillation imparting connection with the Work carrying head.

18. In a machine of the character de-` scribed` in combination, a spindle for carrying a rotary tool, a support forsaid spindle, slid-ably movable, and driving means for the spindle, a Work carrying head mounted for oscillation on an axis angular to the axis ot' the tool spindle and relatively to which the latter is coperatively arranged, and respective automatically operated mechanism for alternately imparting oscillatory movement to the head, and a reciprocatory movement to said spindle support.

longitudinally distensibly and contractibly 19. In a machine of the character dewhich it. is connected mounted for oscillation on an axis angular to the axis of the 'Il o scribed, a spindle, for carrying a rotary tool, a lsupport for said spindle slidably movable in the direction ot' the line ot the axis of the spindle carried thereby, and driving means `for the spindle, a work carrying head mounted for oscillationon an axis angular to the axis ot' the tool spindle and relatively io which the latter is cooperatively arranged, respective mechanism for. alternately iniparting oscillatory n'iovement to the head. and a reciproca tory movement to said spindle support, said spindle support com--l pri ,ing a mcmhe r by which the spindle is carrindn and a member, slidable relative thereto, with which the mechanism for imparting the reciprocatory movement to such support is connected. and means combined with the memli'crs ot said support for both connectimi` tb Ym as a unit and for causing a sliding movement of the one relatively to the other` 'for the, withdrawal oir thelspindle carrying tool from the workin g position relatively to thc oscillatory work holding head.

20. ln a machine of the character described, va spindle carrying a' rotaryl tool, a support foi-said spindle, slidably movable, and driving means for the spindle, ya work carrying. head mounted for oscillation on an axis angular to the line of movement of the tool spindle support and relatively to which the latter is cooperatively' arranged, respective mechanism foi-alternately imparting oscillatory movement to the head, and a reciprocatory movement to said spindle support angular to the axis of oscillation of said head, said spindle support comprising a member on which the spindle is directly supi'iorted, and a member, slidable relative thereto, with which the mechanism for imparting the rcciprocatory movement to such support is connected, means combined with the members of said support'for causing a sliding movement of the one relatively to the other, for the withdrawal ofthe spindle carrying tool from the working position :relatively to the oscillatory Work holding head, and an adjustable stop, up to which the member which directly supports the tool spindle may be brought in its movement toward the work holder carrying head.

2l. ln a machine of the character described, a spindle carrying a rotary tool, a support for said spindle which is slidably movable, and driving` means for the spindle, an oscillatory work carrying head relatively to which the tool spindle is cooperatively arranged, mechanism for' impartlng a reciprocatory movement to said tool spindle support angular to the axis of oscillation of the head, saidlspindle support conlprising a member by which the spindle is carried, and a member, slidablc relative thereto with which the mechanism tor iinparting the recipnmatory movement to such support is connected, and means combined with said members for causing a sliding movement of the one relatively to the other, tor the Withdrawal of the spindle carrying tool 'from its working position relatively to the work holding head.

22. In a machine of the character described, in conibination, a support carrying a rotary tool spindle which is slidably mounted, a work carrying head mounted for oscillation on. an axis angular to thc line of 'movement-of the tool spindle support, a rotary shaft having two cams thereon, piv cted levers with which the cams coact, and links connected to said levers, one thereof having anoscillation imparting connection with the tool carrying head, and the other a reciprocaton imparting connection with the said slidable tool spindle support.

23. In a machineo the character described, in combination, a rotary tool spire dle and a support therefor which is slidably mounted andwhich is composed of two members, the first carrying the spindle and adapted for a slide movement relatively to the second member, rack teeth on the second member and a gear rotatively mounted on the first member and engaging the rack teeth, and a handle for Anormally rotating the gear, a work carrying head'mounted for oscillation on an axis angular tothe line of novement of the tool spindle support, a ro` tary shaft having tv vb cams thereon, piv` bted levers with which the cams coact, and

links connected to said levers, one thereof having an oscillation imparting connection with the tool carrying head, and the other a reciprocation imparting connection with the aforenamed second memberof said slidable tool spindle support.

'24. In a machine of the character described, in combination, a work carrying head mounted for oscillation and means for imparting oscillatory movement thereto, a

spindle for carrying a rotary tool arranged angular to the axis of osclllation of said head, a slide movable along a line parallel with thc spindle axis, and a slide by which the spindle is directly carried movable on the first named slide transversely ol the line of movement of such slide and having a feed screw, a ratchet wheel having driv1ng connection with the feed screw, a swinging pawl carrier provlded with a pawl coacting with the ratchet wheel, end means for automatically imparting a swingmg movement tothe pawl carrier.'

25.In a machine of the character described, in combination, a work carrying head mounted for oscillation and means for imparting oscillatory movement thereto, a spindle for carrying a rotary tool arranged angulary to the axis of oscillation of said head, a slide' movable along a line parallel with the spindle axis, and a slide by which the spindle is directly carried movable on 

